LUCY WRIGHT SMITH 
473 
conspicuously corrugated with brown. Antennae pale brown, first segment 
with a tendency tow^ard darker coloration above. Under side of head pale; 
palpi pale to browmish. 
Pronotum yellowish -browm, about as broad as the head, nearly square, in 
one male specimen slightly wider posteriorly; occasionally anterior and poste- 
rior margins a trifle arcuated; a broad, median, yellow band dilated at either 
end, the posterior dilation greater than the anterior, in some specimens a fine, 
brown stripe running through the center of the yellow band, the lateral areas 
conspicuously marked wdth shiny, browm embossings. Above, the meso- and 
metathorax glossy dark brown with a pale, median, narrow, triangular spot on 
the anterior border. The entire thorax whitish beneath, with darker markings 
on the middle areas. Legs yellowish-brown, femora with stripes of brown along 
the outer aspect, broadening into a ring above the knees, base of tibiae' and 
tip of tarsi dark -browTi. Wings brownish -yellow, darker on the costal margin, 
a rich netwmrk of cross-veins in the apical part of the wing in the region ante- 
rior to media (fig. 61). Males both long and short wdnged. Four pairs of 
tracheal gills (not five as stated by Hagen p. 576) in the form of small, white, 
fleshy, blind sacs, situated as follows; one pair placed far apart on the basal 
portion of the submentum and pointing outward, a pair on the prothorax a 
little lateral and anterior to the base of the fore legs, and a pair on the anterior 
post-marginal area of each of the last tw'o thoracic segments on a line with the 
base of the legs, these point obliquely inward and downward. 
Abdomen dark brown above, pale at the tip and beneath, setae about two- 
thirds as long as the body, brownish, darkest at the tips of the segments. 
Male. The apical half of the ninth segment, yellow; on the dorsum its 
posterior border recurvate, transversely cariniform, thickened, slightly emar- 
ginate in the middle region, villous; on the venter the ninth segment consider- 
ably produced with an elliptical margin. The tenth segment concealed by 
the ninth below, cleft above with yellow, appendage-like, spinous, processes 
directed upward, on the inner posterior margin of either lobe. In one speci- 
men a brown band across the process, just before the tip. Between the poste- 
rior border of the tenth dorsal segment and the sub-anal plates the para-geni- 
tals show on either side of the stylets. The median stylet rises above the para- 
genitals as a thin, rod-like appendage directed obliquely backward, the ante- 
rior portion is brown, while the posterior part appears w'hite, being ensheathed 
with a membranous covering, on either side of the anterior portion of the 
central portion of the stylet, and closely opposed to it, the laterals show as 
small triangular plates (fig. 43). 
Female. Subgenital plate large, reaching about two-thirds across segment 
nine, and nearly three-quarters as wide as the segment, with a deep, narrow 
median cleft forming two circular lobes very close together. The tenth tergite 
triangularly produced with a slight, median longitudinal depression (fig. 44). 
We have four males (three alcoholic); one (long-wing;e(l) from 
Howsei, Selkirk Mountains, British Columbia, VI, 22, 1905 
(Bradley); one (short- winged) from Emerald Lake, Canadian 
TRANS. AM. ENT. SOC., XLIII. 
